纳米钯铜改性毛竹炭三维电催化还原水中硝酸盐氮的机理研究

为揭示三维粒子电极对电催化还原水中硝酸盐氮(NO₃-N)的贡献及机理，以毛竹生物炭为模板，通过钯铜盐浸渍、焙烧及氢气有限表面还原等手段，制备了纳米钯铜改性毛竹炭(Nano-Pd/Cu-BC)，以其为三维粒子电极搭建三维电催化还原体系，以强化传统电催化还原体系(无三维粒子电极)对NO₃-N的去除效果. 结果表明:①制备的Nano-Pd/Cu-BC保留了毛竹天然的遗态分级多孔结构特征，表面存在均匀分散的纳米Pd0和纳米Cu0金属粒子. ②三维电催化还原体系对水中NO₃-N具有更高的去除率，在反应240 min内，对NO₃-N的质量催化活性达0.069 mg/mg，较传统电催化还原体系提升5.35倍. ③三维电催化还原体系N₂的生成率为13.4%，较传统电极电催化还原体系提升2.84倍. 研究显示，采用Nano-Pd/Cu-BC搭建的三维电催化还原体系可以提升水中NO₃-N的去除率和N₂生成选择率. 

Electrocatalytic Reduction of Nitrate on Pd/Cu Bamboo Biochar Particle Electrodes

In order to reveal the contribution and mechanism of three-dimensional (3D) particle electrode to the electrocatalytic reduction of nitrate nitrogen (NO₃-N) in water, a nanometor Pd/Cu-modified bamboo biochar (Nano-Pd/Cu-BC) was prepared using bamboo biochar as template by means of Pd/Cu salt impregnation, roasting and finite surface H₂ reduction. A 3D electrocatalytic reduction system was then established with the 3D particle electrodes to enhance the efficiency of the NO₃-N removal from water by traditional electrocatalytic reduction. The results showed that the prepared Nano-Pd/Cu-BC retained the natural hierarchical porous structure of bamboo, and nano-Pd0 and nano-Cu0 metal particles were uniformly dispersed on the surface. The 3D electrocatalytic reduction system exhibited a higher removal rate of NO₃-N from water, i.e., the mass catalytic activity of NO₃-N and the N₂ yield reached 0.069 mg/mg and 13.4% in 240 min, which were 5.35 and 2.84 times higher than those of the traditional electrocatalytic reduction system without 3D particle electrodes, respectively. Research demonstrated that the electrocatalytic reduction system with nano-Pd/Cu-BC as 3D particle electrodes can improve the removal rate of NO₃-N and the selection rate of nitrogen generation in water.